Using archival data for a sample of U.S. presidents evidence was found for a honeymoon and hangover effect in approval ratings over time. That is presidential approval tended to be high early in the president's term and decrease over time. The effect of time on approval persisted even when military and economic indicators were included as predictors of presidential approval. More importantly the effect of time on approval was moderated by charisma such that charismatic leaders better maintained their approval rating over time. We take this as evidence that the honeymoon/hangover effect on presidential approval is substantively meaningful from a psychological perspective.